Light-Emitting Device and Method for Manufacturing Same

Active Publication Date: 2013-02-14
OSRAM OPTO SEMICON GMBH & CO OHG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a light-emitting device which includes a wavelength conversion part made of a light-transmissive ceramic layer. The ceramic layer is formed without causing coloring or unevenness, and can be used for a long time. The ceramic layer also contains layered silicate mineral and inorganic particulate, which improves its strength. The ceramic layer can effectively suppress other factors such as settling of phosphor. The content of layered silicate mineral or inorganic particulate in the ceramic layer can improve the viscosity of the mixture prior to heating and prevent color unevenness in the light-emitting device. The ceramic layer also maintains its strength after heating. This invention aims to create a more stable and uniform light-emitting device with improved performance.

Problems solved by technology

However, the specific gravity of the phosphor is greater than that of the transparent resin, and accordingly there is settling of the phosphor before the resin has cured, which causes color unevenness during light emission, among other problems.

Method used

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  • Light-Emitting Device and Method for Manufacturing Same
  • Light-Emitting Device and Method for Manufacturing Same
  • Light-Emitting Device and Method for Manufacturing Same

Examples

Experimental program
Comparison scheme
Effect test

working example 1

[0105]0.02 g lipophilic, surface-treated smectite (Lucentite SPN, manufactured by Co-op Chemical) was mixed and dispersed into 1 g of a polysiloxane dispersion (14 wt % polysiloxane and 86 wt % isopropyl alcohol). 0.6 g of the phosphor prepared in the preparation example described above, 0.03 g silicon oxide particulate having a median diameter (D50) of 25 nm (NanoTek Powder, manufactured by CIK NanoTek), and 0.45 g pure water were mixed into this dispersion, thus preparing a mixture.

[0106]The mixed amounts of polysiloxane, smectite, phosphor, and silicon oxide particulate were determined such that the sum of the percentages by weight within the ceramic layer after heating and polymerization would reach 100 wt % (the same also applies to working examples 2 to 11 and comparative examples 1 to 7 described below).

working example 2

[0107]A mixture was prepared by a method similar to that of working example 1, except in that the mixed amount of the phosphor was 1.1 g and the mixed amount of the pure water was 0.38 g.

working example 3

[0108]0.01 g lipophilic, surface-treated smectite (Lucentite SPN, manufactured by Co-op Chemical) was mixed and dispersed into 1 g of a polysiloxane dispersion (14 wt % polysiloxane and 86 wt % isopropyl alcohol). 0.7 g of the phosphor prepared in the preparation example described above, 0.03 g of silicon oxide particulate having a particle size distribution of 1 to 24 μm and a median diameter (D50) of 3 μm (Hi-Silica F3, manufactured by Nitchitsu), and 0.07 g of pure water were mixed into this dispersion, thus preparing a mixture.

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Abstract

A light-emitting device (100) is provided with a metal part (2) atop a planar LED substrate (1), and an LED element (3) is disposed atop the metal part (2). A glass substrate (5) is provided to an upper surface of the LED element (3), and a wavelength conversion part (6) is formed on an upper surface of the glass substrate (5). The wavelength conversion part (6) comprises a light-transmissive ceramic layer formed by heating a mixture containing a phosphor, an organometallic compound, a layered silicate mineral, an inorganic particulate, an organic solvent, and water.

Description

TECHNICAL FIELD[0001]The present invention relates to a light-emitting device having a light-emitting element as well as a wavelength conversion part including a phosphor for converting the wavelength of light emitted from the light-emitting element.BACKGROUND ART[0002]In recent years there has been increasingly widespread use of a technique for obtaining white light-emitting diodes (LEDs) by arranging an yttrium aluminum garnet (YAG) phosphor or other type of phosphor in the vicinity of a gallium nitride (GaN)-based blue LED chip, and color-mixing the blue light emitted from the blue LED chip and yellow light emitted by secondary emission upon the phosphor receiving the blue light.[0003]With a white LED of such description, there is generally employed a method for using a transparent resin throughout which the phosphor has been dispersed, to seal in an LED chip and / or a mounting part. However, the specific gravity of the phosphor is greater than that of the transparent resin, and a...

Claims

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Application Information

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IPC IPC(8): H01L33/00C09K11/08
CPCC09K11/7774H01L33/501H01L2933/0041C04B35/44C04B35/50C04B2235/3224B82Y30/00C04B2235/3418C04B2235/349C04B2235/483C04B2235/5436C04B2235/5454C04B2235/9646C04B2235/3225H01L2224/16
Inventor HATANO, TAKUJIADACHI, HITOSHIWASHIZU, TAKASHITAGUCHI, YOSHIHITO
Owner OSRAM OPTO SEMICON GMBH & CO OHG
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